Effects of current generation and electrolyte pH on reverse salt flux across thin film composite membrane in osmotic microbial fuel cells.
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| Title: | Effects of current generation and electrolyte pH on reverse salt flux across thin film composite membrane in osmotic microbial fuel cells. |
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| Authors: | Qin, Mohan1, Abu-Reesh, Ibrahim M.2, He, Zhen1 zhenhe@vt.edu |
| Source: | Water Research. Nov2016, Vol. 105, p583-590. 8p. |
| Subjects: | Composite membranes (Chemistry), Microbial fuel cells, Electrolytes, Thin films, Osmosis, Water quality, Extraction (Chemistry) |
| Abstract: | Osmotic microbial fuel cells (OsMFCs) take advantages of synergy between forward osmosis (FO) and microbial fuel cells (MFCs) to accomplish wastewater treatment, current generation, and high-quality water extraction. As an FO based technology, OsMFCs also encounter reverse salt flux (RSF) that is the backward transport of salt ions across the FO membrane into the treated wastewater. This RSF can reduce water flux, contaminate the treated wastewater, and increase the operational expense, and thus must be properly addressed before any possible applications. In this study, we aimed to understand the effects of current generation and electrolyte pH on RSF in an OsMFC. It was found that electricity generation could greatly inhibit RSF, which decreased from 16.3 ± 2.8 to 3.9 ± 0.7 gMH when the total Coulomb production increased from 0 to 311 C. The OsMFC exhibited 45.9 ± 28.4% lower RSF at the catholyte pH of 3 than that at pH 11 when 40 Ω external resistance was connected. The amount of sodium ions transported across the FO membrane was 18.3–40.7% more than that of chloride ions. Ion transport was accomplished via diffusion and electrically-driven migration, and the theoretical analysis showed that the inhibited electrically-driven migration should be responsible for the reduced RSF. These findings are potentially important to control and reduce RSF in OsMFCs or other osmotic-driven processes. [ABSTRACT FROM AUTHOR] |
| Copyright of Water Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 118813449 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Effects of current generation and electrolyte pH on reverse salt flux across thin film composite membrane in osmotic microbial fuel cells. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Qin%2C+Mohan%22">Qin, Mohan</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Abu-Reesh%2C+Ibrahim+M%2E%22">Abu-Reesh, Ibrahim M.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22He%2C+Zhen%22">He, Zhen</searchLink><relatesTo>1</relatesTo><i> zhenhe@vt.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Water+Research%22">Water Research</searchLink>. Nov2016, Vol. 105, p583-590. 8p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Composite+membranes+%28Chemistry%29%22">Composite membranes (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Microbial+fuel+cells%22">Microbial fuel cells</searchLink><br /><searchLink fieldCode="DE" term="%22Electrolytes%22">Electrolytes</searchLink><br /><searchLink fieldCode="DE" term="%22Thin+films%22">Thin films</searchLink><br /><searchLink fieldCode="DE" term="%22Osmosis%22">Osmosis</searchLink><br /><searchLink fieldCode="DE" term="%22Water+quality%22">Water quality</searchLink><br /><searchLink fieldCode="DE" term="%22Extraction+%28Chemistry%29%22">Extraction (Chemistry)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Osmotic microbial fuel cells (OsMFCs) take advantages of synergy between forward osmosis (FO) and microbial fuel cells (MFCs) to accomplish wastewater treatment, current generation, and high-quality water extraction. As an FO based technology, OsMFCs also encounter reverse salt flux (RSF) that is the backward transport of salt ions across the FO membrane into the treated wastewater. This RSF can reduce water flux, contaminate the treated wastewater, and increase the operational expense, and thus must be properly addressed before any possible applications. In this study, we aimed to understand the effects of current generation and electrolyte pH on RSF in an OsMFC. It was found that electricity generation could greatly inhibit RSF, which decreased from 16.3 ± 2.8 to 3.9 ± 0.7 gMH when the total Coulomb production increased from 0 to 311 C. The OsMFC exhibited 45.9 ± 28.4% lower RSF at the catholyte pH of 3 than that at pH 11 when 40 Ω external resistance was connected. The amount of sodium ions transported across the FO membrane was 18.3–40.7% more than that of chloride ions. Ion transport was accomplished via diffusion and electrically-driven migration, and the theoretical analysis showed that the inhibited electrically-driven migration should be responsible for the reduced RSF. These findings are potentially important to control and reduce RSF in OsMFCs or other osmotic-driven processes. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Water Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.watres.2016.09.028 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 8 StartPage: 583 Subjects: – SubjectFull: Composite membranes (Chemistry) Type: general – SubjectFull: Microbial fuel cells Type: general – SubjectFull: Electrolytes Type: general – SubjectFull: Thin films Type: general – SubjectFull: Osmosis Type: general – SubjectFull: Water quality Type: general – SubjectFull: Extraction (Chemistry) Type: general Titles: – TitleFull: Effects of current generation and electrolyte pH on reverse salt flux across thin film composite membrane in osmotic microbial fuel cells. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Qin, Mohan – PersonEntity: Name: NameFull: Abu-Reesh, Ibrahim M. – PersonEntity: Name: NameFull: He, Zhen IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 11 Text: Nov2016 Type: published Y: 2016 Identifiers: – Type: issn-print Value: 00431354 Numbering: – Type: volume Value: 105 Titles: – TitleFull: Water Research Type: main |
| ResultId | 1 |
